Drill guide for template drilling



March 6, 1945.

I J. BASTA DRILL GUIDE FOR TEMPLATE DRILLING Filed March-6, 1944 2 Sheets-Sheet l INVENTOR. J05EPH BASTA March 6, 1945. J. BASTA 2,370,770

DRILL GUIDE FOR TEMPLATE DRILLING Filed March 6, 1944 2 Sheets-Sheet 2 v Fig.3. Fig.4

INVENTOR. JO5EP H BASTA Patented Mar. 6, 1945 UNITED" STATE-S PATENT, orncr.

mum. GUIDE FOR PLATE DRILLING Joseph Basta, Westbury, N Q Y.

ApplicationjMar-ch fi, 1344,'Serial No. 525,325

' 50laimn- (can-55f This invention relates to improvements in drill pleted, the drill is removed or withdrawn from said bore of the tip by the operator and heldin elevated position in relation to the tip untilthe form; to provide means whereby an initially-bent sectionof the cage-like structure will function as a guide for the starting and subsequent contracting movements of the device; and to provide an arrangement or the spring slatsthat, during the drill-insertion movement will cause them to spread outwardly to provide'greaterv visibility and next drilling operation, when it is again moved downwardly, inserted bore of the tip. g

' It is desirable, in order to assist the operator in speedy and accurate productiomthat the inand passed" through said sertion and removal movements of the drill be guided so that when the drilling-head'is'moved downwardly by the operator in the actor drilling,

the drill will be guided to enterthe bore of'the Y l leretofore, certain devices have been used for,

the purpose specified which comprised expansible and contractible spiral springs, butsuch devices have not been satisfactory or eilicient in the performance of the necessary functions, audit is the primary object of my invention to provide a drill-guide that will perform its necessary guiding functions in a more satisfactory manner, both in the insertion and removal movements of the drill; that will provide greater accuracy of said guided movements of the drill over prior? art devices; and that will provide greater visibility of such movements for the operator;

Another object is to provide increased contraction and expansion of the. guidato permit use of greater lengths of drills, and consequently to permit drilling of an increased number of sheets of metal in one operation. Other objects of my invention are: to utilize a drill-guide comprising a longitudinally-" contractible and expansible cage-like structure having a body portion formed of spring slats spaced from each other and surrounding a common axis so that thedrill positioned at said axis will be visible and accessible at all times during the drilling operation; to provide means whereby, during the guided drill-insertion and drill-withdrawal movements, the spring-retarding and guiding actions willbe substantially constant and uniaccessibility of the driIIto the operator, while inthe withdrawal movement andin withdrawn, elevated" position, the drill guide will. still permit sufficient and satisfactory visibility and accessib'llity for adjustments and'renewals that may be required; to provide a device that will be strong and durable, simple .in construction,,positive in operation, economical to manufacture, that will not be likely to get out of order and that when not in use will maintain; its normally-operative position and, act as a guard for the drill.

With the above and other objectsin view,the invention comprises the combination of members and, arrangement of parts so combinedas to coact and co operate with each other in the performance of the functions and the accomplishment of the results herein specified, and comprises in one of its adaptations the species or'preferred Vfcrm illustrated .in the accompanying drawings, in which:

Fig. 1 is a, view in front elevation of a drill guide embodying my invention;-

Fig. 2 is atop plan view of the upper fastening Fig. 5 is alplan view of the lower ring of my said drill-guide; 1

6 is a view in side elevation of therin shown in Fig. 5; i

Fig.7 7 is a view similar to Fig. 6 with a part of the wall broken away to show the tapped internal bore; and Fig. 7a is a view, in side elevation, oia standard oriconventional tip, shown separated from the; mounting ring, and turned one-quarter of. a revolution from the position of said tip shown in Fig. 1.

Referring now to these drawings, l indicates a, non-rotatable collar opdrill-head having a chuck 2 in which is mounted a dril 3, and 4 shows a standard or conventional tip having a tapered body portion 4' merging with a cylindrical termihead is depressed in the drilling operation. In such outward bellying movement, the lower portion I60. moves less than the upper section and the lower ends act like fulcrums to enable the drill to be moved axially within said drill-guide body or cage-like structure.

The hollow sleeve or ring i 4 has, as shown in Fig. '7 a tapped bore I9 and-the threaded end of the conventional tip 4 is mounted in said tapped bore H! with its bore 6 in co-axial alignment therewith.

In operation, it will be clear from the above that downward pressure exerted on the head spring plates or slats so arranged as to permit an outward bellying or spreading movement in the plane of their longitudinal axes when pressure is applied at their upper ends. Said slats or plates are supported at their top and bottom ends to provide said cage-like structure that is capable as a whole of contraction and expansion along a longitudinal axis by a spreading outwardly from and a movement inwardly toward said longitudinal axis. As illustrated, said cage-like structure is composed of an upper circular supporting member IU of a diameter capable of fitting over a drill-head, a lower circular supporting member M of lesser diameter, and a plurality. or series of identical intermediate plate or slat spring either manually or otherwise, will cause the drill shown in dotted lines in Fig. l to be guided in its downward movement along the axis of the :drill-guide body and into and through the bore 5 of the tip for a drilling operation, and that when members i6 spanning in length a vertical space between the supporting members and laterally spaced from each other to produce said vertically-slatted cage-like structure which when mounted on a drill-head will house the drill and cause it to extend eo-axially within the same and will guide the drill, when the head is depressed manuallypr otherwise, to move along the axial line Of the cage and into the bore of the conventional tip when the same is suitably mounted in said drill guide.

The upper supporting member i0 comprise as shown a split ring adapted to encircle and be fastened to a drill-head in such manner that the drill and chuck extend axially within said body or cage-like structure. As shown, the member Ill is split at its terminal ends II and a screw I2 is arranged to connect said ends and draw them together to fasten said supporting member on the drill-head I. Said supporting member ID is, as

shown, provided with three symmetrically-arranged notches I3 which provide seats for the top ends Hib of the slats. These top ends are reduced in width to fit said notches and are fastened therein to the said supporting ring 10 by bolts H.

The lower ring l4 preferably comprises a hollow sleeve and is provided with notches l5 formcomprising an outward curvature or elliptical bend so as to enable an initial easy contracting movement and a similar easy outward bellyingor resilient movement of said members 16 when the such drilling operation is completed, and downward. pressure .on the head is relieved, the drill again will be automatically. guided axiallyto the approximate elevated position within the drillguide body shown in Fig, 1.

Having described my invention, I claim:

1. A drill guide comprising a longitudinallycontractible and expansible cage-like structure having a body-portion formed of a plurality of longitudinally-extending resilient slats spaced from each other and surrounding a given axis, and holder means at opposite ends of said slats for fastening and retaining said slats in said cage-like structure. v 2. A drill-guide as specified in claim lin which the cage-like structure has an initially-bent sec- ,tion for facilitating the starting and subsequent contracting and expanding movements.

3. A drill guide comprising a longitudinallycontractible and expansible cage-like structure having a body portion formed of a. plurality of longitudinally-extending resilient slats spaced from each other and surrounding a common axis, and holder means at opposite ends of. said slats for fastening and retaining said slats in said cage-like structure, each of said slats having an upper section provided with an outwardly-bowed .elliptical bend. w 4. A drill-guide as specified in claim 3 in which the holder means is composed of circular top and bottom members, and the circular bottom member is of much smaller diameter than the upper member, and each has seats for mounting the opposite ends of the resilient slats.

5. A drill guide comprising a longitudinallycontractible and expansible cage-like structure having a bodyportion'formed of a plurality of longitudinally-extending resilient. slats spaced from each other and surrounding a common axis, and circular top and bottom members provided with seats for mounting the opposite ends of the resilient slats, means for fastening said slats in said seats, the bottom member comprising a tappedsleeve for the reception of a template drilling tip and being of much smaller diameter than the upper circular top member.

JosnPH BAsTA. 

